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08/11/02 00:30
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#27041 - Port problems with AT89C52
Ports 1,2,3 are stuck HIGH on my AT89C52. I'm supplying a clean +5V (through a LM7805 and some capacitors) to pin 40 (VCC) and pin 31 (EA). pin 20 is tied to GND, and i'm using a regular 11.0592 Mhz crystal. The code SDCC generates looks ok, its just a simple P1_2 = 0, etc..

I found another thread over the topic, but his problem was he left the EA pin floating, which I am not.

Help and thanks,
Chris

List of 19 messages in thread
TopicAuthorDate
Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      
RE: Port problems with AT89C52            01/01/70 00:00      

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